I, also, am impressed with the spinach idea...and the blender actually. We used blue food coloring and it was still a big hit. We did a bunch of other things all day long, including a list of all our Dr. Seuss books in a jar and let my 3 year old choose a title every once in a while throughout the day. I didn't do everything I'd thought of, but it was still a very exciting day. You can see some of them here: http://oliverandmegan.blogspot.com/2012/03/if-you-think-about-seuss.html